Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Components Of Benefit (Provision) For Income Taxes

The components of the provision for income taxes are as follows (in thousands):

	Year Ended December 31,
	2018			2017			2016
Current:
Federal	$	(4,791	)	$	(159	)	$	(13,290	)
State	(2,946		)	(925		)	(1,501		)
	(7,737		)	(1,084		)	(14,791		)
Deferred:
Federal	(6,437		)	(8,389		)	5,175
State	29			(110		)	687
	(6,408		)	(8,499		)	5,862
Total provision for income taxes	$	(14,145	)	$	(9,583	)	$	(8,929	)

Reconciliation Of Statutory Federal Income Tax Rate To Effective Tax Rate

Reconciliation of the statutory federal income tax rate to the Company’s effective tax rate for the years ended December 31, 2018, 2017 and 2016:

	Year Ended December 31,
	2018		2017		2016
Tax provision at U.S. statutory rate	21	%	35	%	35	%
State income taxes, net of federal benefit	6		2		2
Permanent items - other	1		1		2
Research and development credits	(2	)	(1	)	(3	)
Stock-based compensation	9		(22	)	1
Other	(1	)	(1	)	(1	)
Change in tax rate	1		1		—
Provision for tax	35	%	15	%	36	%

Deferred Tax Assets (Liabilities)

Deferred tax assets (liabilities) consist of the following (in thousands):

	December 31, 2018			December 31, 2017
Deferred tax assets:
Net operating loss carryforwards	$	443		$	1,716
Stock-based compensation	12,092			11,778
Research and development and other credits	2,170			6,961
Reserves	6,952			5,417
Intangible assets	2,141			947
Gross deferred tax assets	23,798			26,819
Deferred tax liabilities:
Property and equipment	(4,644		)	(3,874		)
Goodwill	(17,672		)	(12,802		)
Gross deferred tax liabilities	(22,316		)	(16,676		)
Net deferred tax assets	$	1,482		$	10,143

Reconciliation Of Gross Unrecognized Tax Benefits

A reconciliation of the beginning and ending balances of the total amounts of gross unrecognized tax benefits is as follows (in thousands):

	Year Ended December 31,
	2018		2017		2016
Balance, beginning of year	$	5,078	$	4,765	$	4,429
Increase in tax positions for prior years	130		—		201
Increase in tax positions for current year	370		313		271
Other decreases	—		—		(136		)
Balance, end of year	$	5,578	$	5,078	$	4,765